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Add more LOG messages when starting and ending recovery from a backup

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Three LOG messages are added in the recovery code paths, providing
information that can be useful to track corruption issues depending on
the state of the cluster, telling that:
- Recovery has started from a backup_label.
- Recovery is restarting from a backup start LSN, without a
backup_label.
- Recovery has completed from a backup.

Author: Andres Freund
Reviewed-by: David Steele, Laurenz Albe, Michael Paquier
Discussion: https://postgr.es/m/20231117041811.vz4vgkthwjnwp2pp@awork3.anarazel.de
This commit is contained in:
Michael Paquier 2024-01-25 17:07:56 +09:00
parent c393308b69
commit 1d35f705e1
1 changed files with 34 additions and 0 deletions
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34
src/backend/access/transam/xlogrecovery.c
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@ -603,6 +603,22 @@ InitWalRecovery(ControlFileData *ControlFile, bool *wasShutdown_ptr,
if (StandbyModeRequested)
EnableStandbyMode();
/*
* Omitting backup_label when creating a new replica, PITR node etc.
* unfortunately is a common cause of corruption. Logging that
* backup_label was used makes it a bit easier to exclude that as the
* cause of observed corruption.
*
* Do so before we try to read the checkpoint record (which can fail),
* as otherwise it can be hard to understand why a checkpoint other
* than ControlFile->checkPoint is used.
*/
ereport(LOG,
(errmsg("starting backup recovery with redo LSN %X/%X, checkpoint LSN %X/%X, on timeline ID %u",
LSN_FORMAT_ARGS(RedoStartLSN),
LSN_FORMAT_ARGS(CheckPointLoc),
CheckPointTLI)));
/*
* When a backup_label file is present, we want to roll forward from
* the checkpoint it identifies, rather than using pg_control.
@ -742,6 +758,16 @@ InitWalRecovery(ControlFileData *ControlFile, bool *wasShutdown_ptr,
EnableStandbyMode();
}
/*
* For the same reason as when starting up with backup_label present,
* emit a log message when we continue initializing from a base
* backup.
*/
if (!XLogRecPtrIsInvalid(ControlFile->backupStartPoint))
ereport(LOG,
(errmsg("restarting backup recovery with redo LSN %X/%X",
LSN_FORMAT_ARGS(ControlFile->backupStartPoint))));
/* Get the last valid checkpoint record. */
CheckPointLoc = ControlFile->checkPoint;
CheckPointTLI = ControlFile->checkPointCopy.ThisTimeLineID;
@ -2155,6 +2181,9 @@ CheckRecoveryConsistency(void)
if (!XLogRecPtrIsInvalid(backupEndPoint) &&
backupEndPoint <= lastReplayedEndRecPtr)
{
XLogRecPtr saveBackupStartPoint = backupStartPoint;
XLogRecPtr saveBackupEndPoint = backupEndPoint;
elog(DEBUG1, "end of backup reached");
/*
@ -2165,6 +2194,11 @@ CheckRecoveryConsistency(void)
backupStartPoint = InvalidXLogRecPtr;
backupEndPoint = InvalidXLogRecPtr;
backupEndRequired = false;
ereport(LOG,
(errmsg("completed backup recovery with redo LSN %X/%X and end LSN %X/%X",
LSN_FORMAT_ARGS(saveBackupStartPoint),
LSN_FORMAT_ARGS(saveBackupEndPoint))));
}
/*